| IPR008620 | Nitrogen fixation protein FixH | Family |
| IPR003468 | Cytochrome c oxidase, monohaem subunit/FixO | Family |
| IPR036909 | Cytochrome c-like domain superfamily | Homologous Superfamily |
| IPR009056 | Cytochrome c-like domain | Domain |
| IPR036927 | Cytochrome c oxidase-like, subunit I superfamily | Homologous Superfamily |
| IPR000883 | Cytochrome c oxidase subunit I | Family |
| IPR004677 | Cytochrome c oxidase cbb3-type, subunit I | Family |
| IPR023615 | Cytochrome c oxidase, subunit I, copper-binding site | Binding Site |
| IPR023616 | Cytochrome c oxidase-like, subunit I domain | Domain |